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(No Model.) 4 Sheets-Sheet 1.

D. L-. PETITPIERRE.

WATCH MAKERS LATHE. No. 268,669. Patented May 80, 1882.

| III" N. PETERS. PhalvLilhagr-mphur. Washington, D. c.

2 t e e h S w e e h S 4 H R R E I P T I T P L D a d 0 0 WATCH MAKERSLATHE! No. 258,669.

Patented May 30, 1882.

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(No Model.) 4 Sheets-Sheet 3.

D. L. PETITPIERRE.

WATCH MAKER'S LATHE.

No. 258,669. Patented May 30, 1882.

4 Sheets-Sheet 4.

(No Model.) I

D. L. PETITPIERRE.

WATCH MAKERS LATHE.

I No. 258,669.

Patented May 30, 1882.

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DAVID L. PETITPIERRE, OF OOUVET, NEUFGHATEL, SWITZERLAND.

WATCH-NIAKERS LATHE.

SPECIFICATION forming part of Letters Patent No. 258,669, dated Iday 30,1882.

Application filed January 25, 1882.

To all whom it may concern:

Be it known that I, DAVID LOUIS Pn'rrr- PIERRE, a citizen ofSwitzerland, residing at Oouvet, in the Canton of Neufchatel, haveinvented a new and useful Improvement in Tools for Watch-Makers, (forwhich I have claimed a a patent in France, bearing date December, 1881,)of which the following is a specification.

The said improvement in tools for watchmakers consists in a specialconstruction of the watch-makers lathe, the so-called burin fixe, oruniversal lathe, the purpose of which is to enable completely to finishwith a perfect exactness, and at the same time in the speediest manner,the pillar-plates of watches for a given caliber without the necessityof marking the said caliber on the pillar-plate before placing it on thelathe.

In the annexed drawings, Figure 1 shows a raised plan of my improvedburin fixe. Fig. 2

is a plan, in which a horizontal section shows theparticular dispositionof the axis as Ihave contrived it for the purpose hereinafter set forth.Figs. 3, 4, and 5 represent an elevation view, a plan view, and a backview of the apparatus contrived to perform on the some lathetheboringfor the stones,which apparatus haslikewise been also improved by me.Lastly, Figs. 7 to 14c show the spare plates (plateanx de rechange)which make up the chief part of my invention.

The hollow axis A of the lathe, Fig. 2, revolves in the bearings M andN, in which itis fastened, as in the usual lathes, by the screwnut a.The pin B has its tapped end engaged in the hollow axis A,in which itturns freely. The collet B turning in the socket 1), prevents the pin Bfrom getting out of the axis A. Lastly, the disk I), wedged upon the endof the pin, enables the latter freely to turn.

The universal plate P, with the pinchers, so-called chiens, p p, is, asfar as the other parts are concerned, exactly the same as those of thecommon lathes, and it is fixed upon a pin, 0, provided with a conicalpitch, which exactly fits the hollow axis A. The cylindrical part of thepin 0 is provided with a longitudinal groove,intowhich-the end of thesmall screw a penetrates. On the other hand, this pin 0 is fitted with atapped hole corresponding with the screw B, so that when the latter isscrewed to the pin 0 the plate P is firmly (No model.) Patented inFrance December 13, 1881.

and exactly secured to the axis A of the lathe. Lastly, inside the pin 0is adapted a small centering-pin, e, (broche de centrage,) exactly likethat of the common lathes, so-called burins fixes.

The construction of the axis of the lathe as I have just described it isintended to permit quickly to replace the plate P, which is used to doall the accessory works, by any of the spare plates represented in theFigs. 7 to 14, and to fix the latter firmly to and quite in the centerof the axis A. All these plates bear a pin exactly fitting the axis A,and provided with a cylindrical part and a conical pitch. They are,moreover, all provided with a groove, into which the screw a penetrates,and with a tapped hole corresponding with the screw B. On the otherhand, the universal plate P is alone provided with the centering-pinc,(broche de centrage.)

Caps such as 1" N, &c., the inside diameter of which is exactly equal tothe size of the pillar-plate in question, are screwed upon the plates PB B &c., the depth of their sinking being a little less than thethickness of the said pillar-plate. The caps 0', which are all alike,bear moreover two little pins, a and I), placed on the same diameter andat quite the same distance from the center,which areintendedto determinethe position that the pillar-plate is to assume within the caps, and.which fix the point of the caliber of each mover. Besides this,eaehplate is provided with two pinchers, so-called chiens, gq 41 &c.,the useof which is to fasten firmly the pillar-plate in the caps WW, 85c.Lastly, the push-pieces s s s 8 850., are disposed in such a manner asto enable easily to remove the pillar-plate out of the cap, when thework is finished. These push-pieces s 8 8 &c., are fitted to slide ingrooves in the plates 1? P P, &c., and are made with beveled inner ends,to pass in beneath the back of the pillar-plate and force saidpillar-plate away from the bottom of the cap. Each of the caps, 0 T850., is placed on the plate 1 B &c., in such a manner that the centerof the plate-viz, the geometrical axis of the lathe-exactl v correspondswith one of the points of the caliber namely, with the center of one ofthe movers. These preliminaries granted, it is easy to und erstand how,by making use, moreover, of two bench-marks, o and b the position ofwhich is once for all fixed in the caliber traced out, it will besufficient to place a pllldF'plfltG already turned as to the size andthickness, and provided besides with two holes situated on any diameter,but bored at a distance from the center exactly determined, into the capof the plate which may happen to be placed then on the lathe, to make,without anygrouping, at the required place the sinking necessary for themover corresponding with the position of the cap upon the plate, as wellas for the setting of the stone, 8:0. Thus, forinstance, the caliberbeing given which is represented in Fig. 6, the movers of which are, thebarrel, I; the central wheel, II; the third wheel, III; the fourthwheel, IV; the cylinder-wheel, V; the balance, VI, and the minute-wheel,VII, I dispose upon the seven plates represented in Figs. 7 to 14- thecaps?" 9' ,&c., in such a manner that by placing on the plate P apillarplate turned as to the size and thickness, and provided with theholes corresponding with the pins to and b", the center of thisplate-via, the axis of rotation of the lathe-may correspond with thecenter of the barrel. For the plate P the cap 1' is placed at the centerof the plate, since it corresponds with the central wheel. The cap 0' isplaced on the plate P so that the center of the latter corresponds withthe axis of the third wheel, when the plate provided with the sinking ofthe barrel is fixed to the pins a and I), and so on.

The plates P P &c., corresponding with a given caliber, being onceprepared, it is easy to conceive how the workman must proceed quickly tofinish agreat number of pillar-plates. The pillar-plates are prepared bythe usual mechanical process as to their size and thickness. Moreover,two holes exactly corresponding with all the pins (0 and I) of the capsmust previously be bored into them. It", then, you fix upon the lathethe plate P, the workman must begin thoroughly to prepare the place forthe barrel on all the plates. Replacing then the plate P by 1?, he mustdo the same for the central wheel, and soon until the pillar-plate isready to be gilded or nickeled.

hen making the sinkings, the workman must of course make use of theusual millimetrical divisions which are given on the adjusting-screw Xand Y of the two slides X and Y, and likewise of the stop-knob Z, whichis to be placed once for all for each plateviz., for every mover.

It is almost useless to add that when the caliber for which the plates PI", &c., are disposed shouldhavecome outot'fashion,or should for anyreason whatever no longer be required, the same plates may easily betransformed so as to be available for another caliber. The caps T 1*,&c., may also be made useful again it the diameter of the pillar platebe not smaller than that of the former.

To prepare the sinking for the stone, the workman must use the usualtool represented in the Figs. 3, t, and 5, by means of which he can makethe sinking with exactly the same diameter as that of the stone.

In order to enable the workmen to give to the sinking exactly therequired depth,I have contrived the following disposition of the partswhich are represented in the Figs. 3, 4, and 5: In the support 'I, fixedto the pin bearing the gravcr W of the tool in question, I place ascrew, It, which enables to limit the run of the graver in thelongitudinal direction. I likewise fix to the strap U a little shoe, S,into which the end of the screw engages itself. Let us now suppose thatthe graver be placed exactly on a level with the pillar-plate at theplace where the sinking is to be made into which a ruby must be placed.I stick with a little saliva the ruby against the bottom of the littleshoe S. I then turn the screw 11 until it touches the surface of thestone. If I now take ofi' the latter with pinchers, there will remainbetween the end of the screw R and the bottom of the shoe S a'spaceexactly equal to the thickness of the ruby. Consequently need only sinkthe graver until the screw R reaches the shoe S, and the sinking willhave exactly the required depth.

Having thus described in a simple and clear manner the chief features ofmy invention, what I claim is- 1. In awatch-makerslathe, thetubularshaft A, plate P, and pin 0, in combination with the pin. B, disk B andnuts a 12, substantially as and for the purposes specified.

2. The plate P, in combination with the cap 1", secured thereto, thepins a b in the cap, and the dogs g upon the plate P, substantially asand for the purposes specified.

3. The plate I in combination with the cap 0', plus a 1), dogs q, andpush-pieces s, substantially as and for the purposes specified.

4. The strap U, support T, spindle W, and boring or sinking tool, incombination with the screw It passing through such support, and the shoeS upon the strap U, substantially as and for the purposes specified.

In the manufacture of pillar-plates for watches, the several plates P PP 850., adapted to hold the pillar-plate during the several operations,each provided with a cap to receive the pillar-plate, pins to positionthe pillarplate, and dogs to hold it within the cap, the caps and pinsso placed that the pillar-plate is brought to its proper positionsuccessively upon the respective plates to bring the center to be boredcentral with the axis of the plate to which it is held, as specified.

DAVID LOUIS PETITPIER 1E.

Witnesses:

THEODORE FRUER, Emma SCHNEIDER.

IIS

